Making Homemade Chocolate Pie can be a fun and straightforward experience if you follow these detailed steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) to ensure the pie crust is baked perfectly.
2. Prepare the Pie Crust: Place the pre-made pie crust in a 9-inch pie dish. Use a fork to poke holes in the bottom of the crust to prevent it from bubbling during baking.
3. Pre-bake the Crust: Bake the crust in the preheated oven for about 10 minutes until lightly golden. Remove and set aside to cool.
4. Combine Dry Ingredients: In a medium saucepan, whisk together the granulated sugar, cocoa powder, cornstarch, and salt until combined.
5. Add Milk Gradually: Slowly pour in the whole milk while whisking to ensure no lumps form. Stir until smooth.
6. Heat Mixture: Place the saucepan over medium heat. Continuously stir until the mixture thickens and bubbles, usually about 7-10 minutes.
7. Temper the Egg Yolks: In a separate bowl, beat the egg yolks. Add a small amount of the hot chocolate mixture to the yolks while whisking to temper them.
8. Combine Egg Yolks and Chocolate: Pour the tempered egg yolks back into the saucepan. Continue stirring for an additional 2-3 minutes until fully combined and thickened.
9. Finish the Filling: Remove the saucepan from heat. Stir in the unsalted butter and vanilla extract until the butter is melted and incorporated.
10. Fill the Pie Crust: Pour the chocolate filling into the pre-baked pie crust, ensuring an even layer.
11. Chill: Allow the pie to cool to room temperature. Place it in the refrigerator and let it chill for at least 1 hour or until the filling is set.
12. Serve: Once set, slice and serve the pie with a dollop of whipped cream and chocolate shavings for added flair.

These straightforward steps will guide you in creating an incredible Homemade Chocolate Pie that will undoubtedly impress everyone around you.